This report kindled the interest of Dutch merchants, and several expeditions were sent to the land visited by Hudson. The English were also navigating these waters, and in August, 1610, Captain Samuel Argall anchored in the Delaware, naming the South point of the bay “Cape de la Ware.” About this time the English of Virginia began to call the mouth of the river Delaware Bay in honor of their governor,--a name which was soon applied to the entire river. In the spring of 1616 Cornelis Hendricksen was sent from New Amsterdam (the Dutch trading post at present New York) in the _Onrust_ (Restlessness) to explore the coast southward. He discovered “certain lands, a bay (the Delaware) and three rivers”, making it probable that he ascended to the mouth of the Schuylkill or at least to the Minquas Kill. On his return to Holland in the same year he presented a report and a figurative map, the first of the Delaware known to exist. The river was soon called the South River by the Dutch to distinguish it from the North River or the Hudson. In 1620 Cornelis May of Hoorn sailed up the Delaware, where he discovered “some new and fruitful lands,” and after him the Dutch called the mouth of the river _New Port May_. The year 1621 is an eventful one in the history of the Delaware country. The Dutch West India Company, organized by Willem Usselinx, was chartered in June, and from now on trading expeditions were sent at intervals direct to the South River. In 1623 Captain May of Hoorn erected Fort Nassau on the east side of the river a little below present Camden to protect the beaver traffic and to keep out traders, who had no permit from the West India Company. In a few years, however, the stronghold was deserted. In 1631 Samuel Blommaert in company with others, having purchased certain tracts from the natives, planted a colony on the west bank of the Horn Kill; but all the settlers, except one man, were killed by the Indians, shortly after their arrival, and in 1635 the title was sold to the Dutch West India Company. English and French vessels likewise visited the river for barter with the natives. Two different royal grants given to Englishmen included the Delaware and attempts at settlements seem to have been made by the English. It has also been said that King Charles I transferred his interests in this territory to Sweden about 1634. In the summer of 1633 Fort Nassau was re-occupied by the Dutch. A house was built and other improvements were made. About this time the new commissioner Arent Corsen purchased a tract of land on the Schuylkill from several Indian chiefs, and seems to have erected a blockhouse at a place convenient for the beaver trade. But the fort was soon deserted for the fourth time. In 1636 or 1637, however, a new garrison of about twenty men was stationed there with Jan Jansen as commissioner and Peter May as assistant, and this force was maintained when the Swedes arrived in the spring of 1638.